the most aggressive tor-exit-node blockers are retail sites such as lowes.com.
Lowes doesn’t care about anonymous window shopping - they care about the transactions. Transactions coming from a tor exit node are more likely to be fraudulent than those from a regular shopper not trying to mask their origin.
The cost of implementing a tor exit node blocker is much less than the costs associated with fraudulent orders (and the corresponding increase in chargebacks from those fraudulent orders and the impact that has on the usage fees from the credit card processing companies).